Prime DSE Series - Mathematics Mock Exam Papers (Extended Part) Module 1 Set 3

HKDSE-MATH-EP(M1)(Set 3) − 3 3 © United Prime Educational Publishing (HK) Ltd. Please stick the barcode label here Answers written in the margins will not be marked. Answers written in the margins will not be marked. Answers written in the margins will not be marked. Go on to the next page 2. The number of students entering the school library follows a Poisson distribution with a mean of 15 per hour. The probability that a student entering the school library is a girl is 0.7. (a) Find the probability that there are 10 students entering the school library in a certain hour. (b) Find the probability that there are 10 students entering the school library in a certain hour and exactly 7 of them are girls. (5 marks) Sample © United Prime Educational Publishing (HK) Limited All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publisher.